Finding the Third Proportional to 318.94 and 667.41

Step by Step Solution

1. Step 1: Write the proportion equation
   318.94 : 667.41 = 667.41 : x
2. Step 2: Convert to fraction form
   318.94/667.41 = 667.41/x
3. Step 3: Cross multiply
   318.94x = 667.41 × 667.41
4. Step 4: Simplify right side
   318.94x = 445,431.10
5. Step 5: Solve for x
   x = 445,431.10/318.94
6. Step 6: Final answer
   x = 1,396.61